SquirrelMail : Problem in sending emails

[ronniev]

Squirrel Mail : Problem in sending emails :

The client login into the Squirrel Mail and try to send emails from his email account then the Squirrel Mail shows the following error

ERROR:
Message not sent. Server replied:

Authentication failed
535 Incorrect authentication data

And

Exim log shows the following logs

[root@server~]# cat /var/log/exim_mainlog | grep test@domainname

fixed_login authenticator failed for localhost (domainname ) [127.0.0.1]:58923 I=[127.0.0.1]:25: 535 Incorrect authentication data (set_id=test@domainname)

Then

The simple solution for this issue is to reset the email account password